NAME
statvfs, fstatvfs
— get file system
statistics
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/statvfs.h>
int
statvfs(const
char *path, struct
statvfs *buf);
int
fstatvfs(int
fd, struct statvfs
*buf);
DESCRIPTION
statvfs()
returns information about a mounted file system. path is
the path name of any file within the mounted file system.
buf is a pointer to a statvfs
structure defined as follows:
struct statvfs {
unsigned long f_bsize; /* file system block size */
unsigned long f_frsize; /* fundamental file system block size */
fsblkcnt_t f_blocks; /* number of blocks (unit f_frsize) */
fsblkcnt_t f_bfree; /* free blocks in file system */
fsblkcnt_t f_bavail; /* free blocks for non-root */
fsfilcnt_t f_files; /* total file inodes */
fsfilcnt_t f_ffree; /* free file inodes */
fsfilcnt_t f_favail; /* free file inodes for to non-root */
unsigned long f_fsid; /* file system id */
unsigned long f_flag; /* bit mask of f_flag values */
unsigned long f_namemax; /* maximum filename length */
uid_t f_owner; /* user that mounted the filesystem */
unsigned int f_type; /* filesystem type */
uint64_t f_syncreads; /* count of sync reads since mount */
uint64_t f_syncwrites; /* count of sync writes since mount */
uint64_t f_asyncreads; /* count of async reads since mount */
uint64_t f_asyncwrites; /* count of async writes since mount */
/*
* DragonFly extensions - full uuid FSID and owner
*/
uuid_t f_fsid_uuid;
uuid_t f_uid_uuid;
};
/*
* f_flag definitions
*/
#define ST_RDONLY 0x00000001 /* fs is read-only */
#define ST_NOSUID 0x00000002 /* ST_ISUID or ST_ISGID not supported */
/*
* DragonFly specific flags
*/
#define ST_FSID_UUID 0x40000000 /* f_fsid_uuid field is valid */
#define ST_OWNER_UUID 0x80000000 /* f_owner_uuid field is valid */
The fields of type fsblkcnt_t are reported in units of f_frsize.
fstatvfs()
returns the same information about an open file referenced by descriptor
fd.
RETURN VALUES
The statvfs() and
fstatvfs() functions return the value 0 if
successful; otherwise the value -1 is returned and the global
variable errno is set to indicate the error.
ERRORS
statvfs() fails if one or more of the
following are true:
- [
ENOTDIR] - A component of the path prefix of path is not a directory.
- [
ENAMETOOLONG] - The length of a component of path exceeds
{NAME_MAX}characters, or the length of path exceeds{PATH_MAX}characters. - [
ENOENT] - The file referred to by path does not exist.
- [
EACCES] - Search permission is denied for a component of the path prefix of path.
- [
ELOOP] - Too many symbolic links were encountered in translating path.
- [
EFAULT] - buf or path points to an invalid address.
- [
EIO] - An I/O error occurred while reading from or writing to the file system.
fstatvfs() fails if one or more of the
following are true:
- [
EBADF] - fd is not a valid open file descriptor.
- [
EFAULT] - buf points to an invalid address.
- [
EIO] - An I/O error occurred while reading from or writing to the file system.
SEE ALSO
STANDARDS
The statvfs() and
fstatvfs() system calls conform to
IEEE Std 1003.1-2001 (“POSIX.1”).
HISTORY
The statvfs() and
fstatvfs() functions first appeared in
DragonFly 1.13.